electrical motor power factor & efficiency 3

[somacast]

hello,

I want to know where each figure recorded from the LCD panel of the power feeder of an AC motor driving a machinery goes.

in other words, I have the reading at one instance reads in the panel at electrical room:

KW = 700
KVAr = 800
AMP = 70

and this is on a 11KV feeder.

so what is the 700 over here in a power triangle?

how do I relate to power factor ?

how do I get my electrical efficiency? can I say eff= data sheet kw / reading kw from panel?

Thanks & Regard,

 

[waross]

92 Amps x 11kV x root 3 = 1752.84
What does the data sheet show for efficiency at 100% and at 75% loading?



Bill
--------------------
Ohm's law
Not just a good idea;
It's the LAW!

 

[somacast]

for eff. @ 100% 94%
@75% 93.5%

power factor
@100 its 73%
@75 its 67%

afaik that power factor drops badly if you are operating way below the rated point

 

[LionelHutz]

So, assume the efficiency is between 93.5% and 94%. You can't calculate it without measuring the shaft output power.

 

[somacast]

noted, thanks again ....

so for my readings provided here ,

I1 = 77A
I2= 75
I3 = 77.7 A
U = 10.8 KV
P = 1.01 MW
q= 1.01 MVAR

how is power triangle gonna look like?

 

[LionelHutz]

He posted the same set of numbers again wanting new "better" answers even though electricpete post the power factor answer on 4 Jun 21 @ 23:51 and multiple people had already told him the efficiency can't be calculated from the data he is providing. He doesn't want to believe us hence part of my post more or less saying go figure out how to do it yourself.

 

[waross]

I'm with you, Lionel.
My last quote (so just grow up.) was directed at somacast.
Like "Back at you!"
I am sorry if I was not clear.

Bill
--------------------
Ohm's law
Not just a good idea;
It's the LAW!